JPS63129761A - Callback system from called party - Google Patents

Abstract

PURPOSE:To eliminate trouble of connection by conventional dialing by registering a caller number corresponding to a called party number at a first talking and using a special number dial for callback so as to apply callback connection. CONSTITUTION:When a caller subscriber uses, e.g., a telephone set 4A to make a dial and a central controller 2 discriminates the extension connection from the received dial number, the central controller 2 operates a callback means 21 to read a callback number list 31 of a main storage device 3 thereby registering the caller number corresponding to the called party number, e.g., the telephone number of the telephone set 4B. When the called subscriber dials a special number to make a call with the caller again, the central controller 2 activates the callback means 21 to read the caller number from the callback telephone list 31 to connect the caller and the called party telephone set via a network 1 again. Since the called party has only to dial the specific number to make a call again with the caller, the troublesome connection by conventional dialing is eliminated.

Description

[Detailed Description of the Invention] [Summary] In the extension connection of an electronic exchange, the calling party number is registered in correspondence with the called party number, and after the call, the called party subscriber dials a special number. , the calling subscriber is called back.

[Industrial application field]

The present invention relates to an electronic exchange and, more particularly, to a call-back method from the called side in which the called subscriber calls back the calling subscriber after a call.

In electronic exchanges, for example, private branch exchanges, after a call, if the calling subscriber wants to talk to the called subscriber again, the service is established by dialing a special number instead of using normal dialing. Although it is
There is a demand for a call-back system from the called side, which allows the called subscriber to call the calling subscriber again after the call.

[Conventional technology]

In the conventional call return system of electronic exchanges, after a call, the calling subscriber dials a special number and the call route is set up again. There is no standard service, and connections are made by regular dialing.

[Problem that the invention seeks to solve]

In the conventional call-back system, the calling party can call back the other subscriber by dialing a special number, but the called party has no such means and must use normal dialing. Means for Solving Troublesome Problems] FIG. 1 is a block diagram of the principle of the present invention.

In the figure, ■ is a network, 3 is a main memory that records commands and data related to exchange operations, and 2 is a telephone 4A, 4 that uses the commands and data and is accommodated in network 1.
This is a central control device that interconnects B, etc.

As related to the present invention, 31 is a call-back number table in which the calling party number used for call-back connection is registered, and 21 is a call-back number table 31 in which the calling party number corresponds to the called party number. This is a call-back means that registers the calling party number and reads the calling party number upon connection from the called party, which solves the above-mentioned problems.

[Effect]

When the calling subscriber makes a call, for example from the telephone 48, and the central control unit 2 determines from the received dial digits that it is an extension connection, the central control unit 2 operates the call return means 21 and calls the main controller. The callback number table 31 in the storage device 3 is read and the calling party number is registered in correspondence with the called party number, for example, the telephone number of the telephone 4B.

After the call ends, when the called subscriber dials a special number in order to talk to the calling subscriber again, the central control unit 2 that received the special number operates the call-back means 21 and returns the calling party to the called subscriber. Call return number table 31 using the called number as the key
This allows the calling and called telephones to be connected via network 1 again.

In this way, the called subscriber can talk to the calling subscriber again by simply dialing the special number, thereby eliminating the trouble of establishing a connection using normal dialing.

〔Example〕

The present invention will be specifically explained below with reference to illustrated examples.

Fig. 2 is a block diagram of a call-back method from the called side according to an embodiment of the present invention, Fig. 3 is an explanatory diagram of the registration processing procedure in the call-back number table, and Fig. 4 is an explanatory diagram of the call-back connection processing procedure. It is an explanatory diagram.

The same reference numerals refer to the same objects throughout the design.

In FIG. 2, a registration section 22 and a call-back section 23 correspond to the call-back means 21 in FIG.

The registration of the calling party number will be explained with reference to FIGS. 2 and 3.

When the subscriber of telephone 4A (extension number 5111) goes off-hook, central controller 2 detects this and proceeds to step 5o.
l) Route the dial tone transmission trunk 6 to the network 1 route■
It connects to the subscriber circuit 5A and transmits a dial tone (step 5O2).

The central controller 2 then receives the dialed number of the calling subscriber (step 5O3), and when it determines that it is an extension connection, activates the registration unit 22 (step 504). The registration unit 22 reads the callback number table 31 from the main storage device 3 (step 505), searches for the location of the called party number, and prepares to register the calling party number (5111) (step 506).
.

On the other hand, the normal connection means is activated by the determination of extension connection, and the ring tone from the ring tone generator 9 is sent from the subscriber circuit 5B to the telephone 4B (extension number 5222) (step 5).
08), and a ringing tone is sent out from the ringing tone sending trunk 7 connected to the subscriber circuit 5A via route (2) (step 509).

Next, when the central control unit 2 detects the off-footer of the telephone 4B (step 510), the registration unit 22 selects the calling party corresponding to the currently connected called party number (5222) column of the callback number table 31. The calling party number (5111) is registered in the number column (step 507). Also, use the normal extension connection means to stop sending out the ringing tone (step 5ll), and disconnect the route (2) to stop sending out the ringing tone (step 512).
), the communication path of route (■) is set and both subscribers are allowed to talk (step 513), and when an on-footer of one of the subscribers is detected (step 514), the communication path is restored (step 515).

If it is determined that the connection is not an extension, connection to a central office trunk is performed by normal means, for example.

The callback connection will be explained with reference to FIGS. 2 and 4.

After the call ends, when the called subscriber takes the telephone 4B off-hook to talk to the calling subscriber again, the central control unit 2 detects the off-footer (step 520), and the path
is set, the dial tone transmission trunk 6 is connected to the subscriber circuit 5B, and a dial tone is transmitted (step 521).

When the called subscriber dials a special number for callback, for example 15, the central control unit 2 receives this and sends it to the callback section 23.
(step 522).

The callback unit 23 reads the callback number table 31 from the main storage device 3 (step 523), searches for the called party number (5222), and selects the calling party number (5111) from the corresponding calling party number field.
) is set (Step 524), the route (2) is set, and the service tone transmission trunk 8 is connected to the subscriber circuit 5B to transmit the service tone (Step 525).

On the other hand, the read calling party number is assumed to be a dialed number from the called party and is carried over to the normal extension connection means.
Phone i4A is sent a ring tone (step 526).
.

When the central control unit 2 detects that the telephone 4A on the calling side is off-hook (step 527), the central control unit 2 restores the route ■, opens the service tone transmission trunk 8, and stops transmitting the service tone.In step s2, the call is started via the route ■. A route is set and a call is made (step 529). The call ends,
When an on-footer by any subscriber is detected (step 530), the route ■ is restored (step 531).
.

〔Effect of the invention〕

As explained above, in the present invention, at the time of the first call, the calling party number is registered corresponding to the called party number, and when a callback connection is made by dialing a special number for callback, the above-mentioned call Since the side number is read out and the connection is made, the trouble of making a connection using normal dialing is eliminated.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the principle of the present invention; Fig. 2 is a block diagram of a call-back method from the called side according to an embodiment of the present invention; Fig. 3 is an explanatory diagram of the registration processing procedure in the call-back number table. , FIG. 4 is an explanatory diagram of the callback connection processing procedure. In the figure, 1 is a network, 2 is a central control unit, 21 is a call-back means, 3 is a main storage device, 31 is a call-back number table, and 4A and 4B are telephones.

Claims (1)

[Claims] Telephones (4A, 4B), etc. are housed in a network (1), and interconnection is performed under the control of a central control unit (2) using instructions and data stored in a main memory (3). In the electronic switching system, the main storage device (3) includes a call return number table (31) in which the calling party number is registered, and the central control unit (2) stores the calling party number in correspondence with the called party number. A called party, characterized in that it is provided with a callback means (21) for registering a calling party number in the callback number table (31) and reading out the calling party number when a callback connection is made from the called party. Call back method from the side.